#define STR STR1
#define STR1 "this is a test!"
#define STR2 "This is a test!"
#define STR3 "This is A tEst!"

void do_tests()
{
	string str;
	str = STR1;
	ASSERT(lower_case(str) == STR);
	ASSERT(str == STR1);

	str = STR2;
	ASSERT(lower_case(str) == STR);
	ASSERT(str == STR2);

	str = STR3;
	ASSERT(lower_case(str) == STR);
	ASSERT(str == STR3);
}
